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Description/Abstract

A fast (Τ response <90 fs) free-electron spin-flipping frequency-degenerate nonlinearity with a significant value of |χ(3)xxyy(ω,ω,ω,-ω)χ(3)xxyy(ω,ω,ω,-ω)|~10^-8 esu has been observed in bulk gold at 1260 nm by use of a new pump-probe polarization-sensitive technique.